The thought behind this mapping is that no UX designer is going to be crazy enough to design an application that requires a user to press all four modifier keys at once. RELATED: How to Turn Your Mac's Caps Lock into an Extra Modifier Key On Windows, the Hyper key is emulated with Shift+Control+Alt+Windows. On macOS, this maps to Shift+Control+Option+Command. Nowadays, the Hyper key is emulated with a combination of every modifier key. But the name is cool, and it stuck around as a term for an obscure modifier key that isn’t used by any applications. It’s practically a fossil. You won’t find it on any modern keyboard, and it isn’t supported in any current OS. Hyper was an old modifier key from way back when and was used on the Space-cadet keyboard for Lisp machines.